Dragonflying at Denai Sungai Kebangsaan @ JPS Hulu Langat

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).  

Here are the Odonata species spotted during the field survey along the Denai on 11 April 2026

Family Coenagrionidae

Ischnura sengalensis

Family Libellulidae

Acisoma panorpoides

Aethriamanta gracilis

Brachydiplax chalybea

Crocothemis servilia

Hydrobasileus croceus

Neurothemis fluctuans

Orthetrum chrysis

Orthetrum sabina

Orthetrum testaceum

Pantala flavescens

Rhyothemis triangularis

Rhyothemis variegata phyllis

Tramea transmarina

Figure 1. Google map showing the location of Denai Kebangsaan @ JPS Hulu Langat

Figure 2. The start point of the Denai (point A; see Figure 1)

Figure 3. The end point of the Denai (point B; see Figure 1)

Figure 4. Open marsh (point C; see Figure 1) by the walkway 

Figure 5. A river monitoring station by the walkway 

Figure 6. A section of the walkway 

Figure 7. A stone chair by the walkway

Figure 8. A resting hut  by the walkway

Figure 9. Sungai Langat