It is home to many birds, including seagulls, northern pintails, yellow-nib ducks and black-faced spoonbills. Flora includes reeds and mangroves.
Conservation
In what is considered to be a landmark case in the history of Hong Kong’s planning law regime, the Privy Council upheld the decision of the Town Planning Appeal Board approving development of a large scale residential, golf course, and nature reserve at Nam Sang Wai with conditions. The validity of planning permission was extended three times. In late 2010 a further extension was denied by the TownPlanning Board. The area is threatened by illegal logging and by fires, on land owned by the Nam Sang Wai Development Company, that environmental advocates called "suspicious" and "professionally started".
Recreation
The area is popular for recreational cycling. A proposal was made for a cycle track loop, but this has not been built.
Development proposals
Nam Sang Wai has been the subject of various residential development proposals.
First proposal
In 1992, the Nam Sang Wai Development Company and Kleener Investment Limited, proposed a residential development and a golf course. The plan was originally refused by the Town Planning Board, but was accepted after the developer appealed. The plans approved in 1996 included a 43-hectare golf course and 2,550 homes. The plans subsequently submitted by the developers were rejected by the TPB in 2010, which ruled that the proposal did not meet the conditions laid out in the earlier decision and had to be resubmitted as a fresh application owing to the substantial changes made to their plans. The developers petitioned the Town Planning Appeal Board, which ruled that the TPB had to reconsider. In turn, the TPB had this decision overthrown on judicial review. The developers then approached the Court of Final Appeal, which refused the request for appeal on 16 February 2017.
Second proposal
KHI Holdings Group, which retains 50 per cent of the Nam Sang Wai Development Company Limited, took over the role of project manager in 2011. They put forward a new proposal. The group has initiated the planning process under the Environmental Impact Assessment Ordinance by submitting a project profile to the Environmental Protection Department and applying for a study brief. The NSWD recently launched a website detailing their plans for development.
Third proposal
After the second proposal was rejected, the developer put forward a new proposal, consisting of 28 high-rises and 140 houses to accommodate approximately 6,500 residents. For improved car access, the developer proposed a vehicular bridge spanning the Shan Pui River. It proposed compensatory measures in response to the ecological damage the proposal would inflict on the environment. The Agriculture, Fisheries and Conservation Department responded that it considered "avoidance of any ecological impact as a priority ahead of compensation". It opposed the plans, stating that the development would " on habitats of high ecological value". Likewise, WWF Hong Kong voiced opposition to the proposal. The TPB rejected this proposal on 24 February 2017. In response, the developer said it would appeal.
Arson incidents
Nam Sang Wai has been subjected to repeated fires regarded as suspicious by authorities. Commentators have alleged the fires have been set by arsonists attempting to reduce the environmental value of the area. A suspicious fire occurred in 2010. Another fire on 21 December 2016 scorched an area "larger than the size of a football pitch". A series of fires appeared again in 2018, the first two happening on 12 and 13 March. The Fire Services Department considered these suspicious, and the Hong Kong Police Force are investigating possible arson. Another fire was discovered on 22 March, followed by yet another on 2 April.A video clip later emerged in local media showing two potential witnesses at the scene, even though the Hong Kong Police said they found no CCTV footage at the site.
Access
A small boat in the southern part of Nam Sang Wai serves as a ferry across the Kam Tin River towards the village of Shan Pui Tsuen, north of Yuen Long Kau Hui. A road, the Nam Sang Wai Road, runs along the eastern edge and most of the western edge of Nam Sang Wai.
