Not exactly a lake... more like a long muddy pools formed by the drainage system   ... very tricky to go there...  There's only one narrow entry point for cars surrounded by residential gated communities .. with bicycle logo imprint on the sidewalk at the entry side ... When inside just walk along the path with lots of pokestops .. they keep spawning along the straight path.. 

Update. This exact location got Kabuto + Seel. Frequent spawn.

Having explored some of these nests in person, here's some observations

Dataran Petaling Jaya: Jynx spawn is not often. I noted that only 2 spawn points in this location will spawn Jynx, and these are usually timed at the 0 to 5 minute mark past the hour. One can be reached while walking from A&W, the other is in the middle of the field. When I came here pass the 30 minute mark, no Jynxs Thankfully A&W provided waiting relief

Taman Jaya: This seems to be more of a general water biome than a Jynx nest. When I came here at 2 differing times, no Jynxs were in the sightings. Good thing this is close by Dataran Petaling Jaya so I could alternate between the two.

Kompleks Sukan Astaka: Shellders only appear in the field =.= the field is muddy after the rain so its a real pain to get to the spawn points. Stinks like cow dung as well. Agony

Where are the spawn points  for omanyte?  Are they located on the golf course?

2 hours investment at Ara Damansara Park. No idea what to do with these 😅