It originates from the separation of the Tha Chin river near Bueng Chawak, Suphan Buri province, where it is referred to as the Lam Tha Khoi or Maenam Duan,[1] and flows parallel to the Tha Chin river through Sam Chuk district, where it is referred to as Khlong Rakam,[2] then flows southward near the four sacred ponds (Sa Kaeo, Sa Ka, Sa Yommana, Saket)[a].
It continues to flow south up till it meets with Khlong Bang Yi Sae form the Song Phi Nong river.
The Song Phi Nong river continues southward up till it confluence the Tha Chin river again at Song Phi Nong district, southernmost part of Suphan Buri.
[3] Today, Lam Tha Wa is shallow and full of pollution.
There is an effort from the local government to improve and dredge to bring it back to a perfect stream condition like in the past.