I did an Odonata survey along Denai Sungai Kebangsaan @ JPS Hulu Langat (or known as Denai Sungai Langat) in Bandar Baru Seksyen 3, Selangor (Figure 1) on 11 April 2026, from10 am to 1 pm. The Denai is easily accessed by Persairan Universiti, the road from Bandar Baru Bangi heading to the main entrance of Universiti Kebangsaan Malaysia. The length of the whole Denai (from point A to point B; Figure 1) is roughly 3 km, and it is facilitated by tarred walkway (actually it is a cycling track). The walkway is just along the river bank. The start point of the Denai (point A; Figure 2; 2°55'35"N 101°46'32"E) is next to Persairan Universiti. A small parking space is available at the start point of the Denai (Figure 2). Point A oversees the pond at Bandar Baru Bangi Seksyen 3.The end of the Denai is a dead end (point B; see Figure 3; 2°57'10"N 101°47'6"). A nice open marsh (point C; Figure 4; 2°56'10"N 101°46'50"E) is located about 600 m from the start point, and it is a nice spot to watch dragonflies. A few chairs and a hut are erected along the walkway for visitors (Figures 7 & 8). Fishing enthusiasts frequent the Denai to fish at Sungai Langat. The Denai is also frequented by cyclists. In the 3-hour of survey, I manage to spot 14 species Odonata species, 1 was damselfly and 13 were dragonflies. Most of the odonates were spotted at the marsh (point C).
