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Okavango Delta
Namibia
Date of Submission: 18/03/2016
Criteria: (vii)(ix)(x)
Category: Natural
Submitted by:
Namibia National Commission for UNESCO
State, Province or Region:
Kavango East and Zambezi Regions
Ref.: 6098
Transnational
Description
This delta system in Kalahari Desert comprises permanent marshlands and seasonally flooded plains. It is one of the
very few major interior delta systems that do not flow into a sea or ocean, with a wetland system that is almost intact.
One of the unique characteristics of the property is the progressive annual flooding from the River Okavango that
progress through the system to reach its peak in Botswana during the dry season, with the result that the native
plants and animals have synchronized their biological cycles with these seasonal rains and floods. The biota has
uniquely adapted their growth and reproductive behaviour, particularly the flooded grassland biota, to be timed with
the arrival of floodwater. It is an exceptional example of the interaction between climatic, hydrological and biological
processes. The Okavango Delta is home to some of the world’s most endangered species of large mammal, such as
the cheetah, white rhinoceros, black rhinoceros, African wild dog and lion.
Name(s) of the component part(s)
Portion of Bwabwata National Park, Nkasa Rupara National Park, Kavango East and Zambezi Regions, S18°12’
E21°42’ and S18°23’ E23°37’
Description of the component part(s)
One part (87300 ha, 873 km2) is a portion of the Bwabwata National Park in the Kavango East Region along the
border between Namibia and Botswana and contiguous with the northern boundary of the inscribed Okavango Delta.
Relevant portions include the Mahango and Buffalo Core Conservation areas of the Bwabwata National Park,
separated only by the width of the Okavango River. It includes a Ramsar site and extensive areas of deciduous
Kalahari woodland. The whole area is protected under Namibian legislation as the Bwabwata National Park since
2007, with one part proclaimed as the Caprivi Game Reserve in 1966 and the Mahango portion proclaimed in 1986.
The Nkasa Rupara National Park (31800 ha, 318 km 2) is located in the south-western corner of the Zambezi Region
of Namibia along the border between Namibia and Botswana. It is contiguous with the northeastern boundary of the
inscribed Okavango Delta property. The area consists of a complex network of waterfilled channels, reed beds, lakes
and islands that constitute the Linyanti swamps at the terminus of the Kwando/Linyanti Rivers and the source area for
the Chobe River. It is protected under Namibian legislation since 1990 as the Mamili Game Reserve before being
renamed as the Nkasa Rupara National Park in 2012.
Justification of Outstanding Universal Value
The Okavango Delta is one of a very few large inland delta systems without an outlet to the sea, known as an
endorheic delta, its waters drain instead into the desert sands of the Kalahari Basin. It includes Africa’s third largest
alluvial fan and the continent’s largest endorheic delta. These delta systems comprise permanent marshlands and
seasonally flooded plains. Furthermore it is in a near pristine state being a largely untransformed wetland system.
One of the unique characteristics of the site is that the annual flooding from the River Okavango and associated
rivers progressively inundate the wetland systems into the dry season, with the result that the native plants and
animals have synchronized their biological cycles with these seasonal rains and floods.
The Delta’s dynamic geomorphological history has a major effect on the hydrology, determining water flow direction,
inundation and dehydration of large areas within the system. The site is an outstanding example of the interplay
between climatic, geomorphological, hydrological, and biological processes that drive and shape the system and of
the manner in which the Okavango Delta’s plants and animals have adapted their lifecycles to the annual cycle of
rains and flooding. Subsurface precipitation of calcite and amorphous silica is an important process in creating
islands and habitat gradients that support diverse terrestrial and aquatic biota within a wide range of ecological
niches.
Criterion (vii): Permanent crystal clear waters and dissolved nutrients transform the otherwise dry Kalahari Desert
habitat into a scenic landscape of exceptional and rare beauty, and sustain an ecosystem of remarkable habitat and
species diversity, thereby maintaining its ecological resilience and amazing natural phenomena. The annual floodtide, which pulses through the wetland system every year, revitalizes ecosystems and is a critical life-force during the
peak of the Botswana’s dry season (June/July). The Okavango Delta World Heritage property displays an
extraordinary juxtaposition of a vibrant wetland in an arid landscape and the miraculous transformation of huge
sandy, dry and brown depressions by seasonal floods triggers spectacular wildlife displays: large herds of African
Elephant, Buffalo, Red Lechwe, Zebra and other large animals splashing, playing, and drinking the clear waters of the
Okavango having survived their long migration across the Kalahari Desert.
Criterion (ix): The Okavango Delta World Heritage property is an outstanding example of the complexity, interdependence and interplay of climatic, geo-morphological, hydrological, and biological processes. The continuous
transformation of geomorphic features such as islands, channels, river banks, flood plains, oxbow lakes and lagoons
in turn influences the abiotic and biotic dynamics of the Delta including dryland grasslands and woodland habitats.
The property exemplifies a number of ecological processes related to flood inundation, channelization, nutrient
cycling and the associated biological processes of breeding, growth, migration, colonization and plant succession.
These ecological processes provide a scientific benchmark to compare similar and human-impacted systems
elsewhere and give insight into the long-term evolution of such wetland systems.
Criterion (x): The Okavango Delta World Heritage property sustains robust populations of some of the world’s most
endangered large mammals such as Cheetah, white and black Rhinoceros, Wild Dog and Lion, all adapted to living in
this wetland system. The Delta’s habitats are species rich with 1061 plants (belonging to 134 families and 530
genera), 89 fish, 64 reptiles, 482 species of birds and 130 species of mammals. The natural habitats of the nominated
area are diverse and include permanent and seasonal rivers and lagoons, permanent swamps, seasonal and
occasionally flooded grasslands, riparian forest, dry deciduous woodlands, and island communities. Each of these
habitats has a distinct species composition comprising all the major classes of aquatic organisms, reptiles, birds and
mammals. The Okavango Delta is further recognized as an Important Bird Area, harbouring 24 species of globally
threatened birds, including among others, six species of Vulture, the Southern Ground-Hornbill, Wattled Crane and
Slaty Egret. Thirty-three species of water birds occur in the Okavango Delta in numbers that exceed 0.5% of their
global or regional population. Finally Botswana supports the world’s largest population of elephants, numbering
around 130,000: the Okavango Delta is the core area for this species’ survival.
Statements of authenticity and/or integrity
The property covers most of the Delta, encompassing a vast area of over 2.14 millions ha of substantially undisturbed
wetlands and seasonally flooded grasslands. It is of sufficient size to represent all of the delta’s main biophysical
processes and features and support its communities of plant and animal species. Because of its vast size and difficult
access the delta has never been subject to significant development and it remains in an almost pristine condition.
Tourism to the inner Delta is limited to small, temporary tented camps with access by air. Facilities are carefully
monitored for compliance with environmental standards and have minimal ecological impact. Most importantly, the
source of the Okavango Delta’s waters in Angola and Namibia remain unaffected by any upstream dams or
significant water abstraction and the three riparian states have established a protocol under the Permanent
Okavango River Basin Water Commission (OKACOM) for the sustainable management of the entire river system.
OKACOM has formally supported the inscription of the Okavango Delta on the World Heritage List. It is imperative
that upstream environmental water flows remain unimpeded and that over abstraction of water, the building of dams
and the development of agricultural irrigation systems do not impact on the sensitive hydrology of the property.
Conservation management of the Namibian parts are coordinated in accordance with a Strategic Management Plan
for Namibia’s North-East Parks that includes close cooperation and coordination with indigenous communities. Local
communities and community game guards participate in the management of the Bwabwata National Park component
through a technical committee and the Kyaramacan Association, while the northern border of the Nkasa Rupara
National Park abuts the Balyewa, Wuparo and Dzoti communal area conservancies. Tourism activities and
associated developments are carefully assessed and planned in terms of a Tourism Development Plans to retain the
natural balance of these wetland eco-regions.
Justification of the selection of the component part(s) in relation to the future nomination as a
whole
The Namibian components are contiguous with the inscribed Okavango Delta property. They also form part of the
Kavango-Zambezi (KAZA) Transfrontier Conservation Area, which is a five-country initiative that involves Namibia,
Botswana, Zambia, Zimbabwe and Angola through a web of 22 protected areas that broadens the regional protected
areas network to increase biodiversity and expanding historical game migration routes.
The Bwabwata National Park component shall include the Mahango and Buffalo Core Conservation areas (244 km 2
and 629 km2 respectively. These core conservation areas encompass the upper component of the Okavango Delta
panhandle, which is a critical component of the wetland system as it is the first areas to be inundated during the
important warm summer months of the seasonal flooding cycle. The summer period is a critical period for fish, a
multitude of invertebrates and other aquatic and semi-aquatic fauna that require shallow floodplain conditions to
breed, as well as the birds, mammals and reptiles requiring that bounty during summer for their own propagation. As
the flood waters recede in the shallow upper parts and progressively inundate parts of the Okavango Delta system
downstream, juveniles migrating along with the floodwaters to mature continue to support the intricate ecological
interactions of the system. Once the lower parts of the Delta in Botswana start drying out after the winter, breeding
adults migrate back upstream before a new breeding season commences during summer. In addition, the extensive
deciduous Kalahari woodland adjacent to the river accommodates healthy populations of large herbivores, along with
associated predators, to move to and from the river. Some 869 species of plants from 88 families, including majestic
baobabs, Zambezi teak and African teak occur in the mature and undisturbed riparian and Kalahari woodlands. In
addition, 71 species of fish, 5 amphibian species, >100 mammal species and around 450 bird species have been
recorded here.
The Nkasa Rupara National Park is Namibia’s mini Okavango Delta and is the largest protected wetland area in
Namibia. Ecological processes in the Nkasa Rupara wetlands mirror that of the larger Okavango Delta by being
flooded by the Kwando/Linyanti Rivers during the wet summer months. However, due to its small size the seasonal
floods progress fairly rapidly through the system, resulting as much as 80% of the park becoming inundated by water
and inaccessible during the wet season before discharging as the Chobe River. During this period it serves as an
important secluded breeding area for birds, fish, invertebrates and other resident animals, with herds of elephant,
buffalo and other animals freely migrating from the Okavango Delta and converging from adjacent areas in Botswana
to feed on the lush vegetation. Even during the dry season the pools, channels and marshy areas abound with fish,
crocodiles, hippopotamus, red lechwe, reedbuck and birds (~450 species recorded). These wetlands are a central
component in the historical migration routes of animals such as elephants and buffalo that links populations in Angola
and Zambia with those in Botswana and Zimbabwe.
Comparison with other similar properties
The Okavango Delta was inscribed on the World Heritage List in 2014. The parts in Namibia extend the inscribed
area to include small but important areas to maintain the ecological functioning and integrity of the inscribed area.