Which beach area in Nha Trang has the cleanest water (north vs south, river runoff)?

Update on the north beach: it's currently low tide, so the sea isn't very clean and the views aren't ideal, but it's still better than the central beach.

New Tien beach was liked overall, but visitors reported a lot of trash floating in the water.

Doc Let beach gets mixed reviews: one traveler found clean water, white sand, and few crowds, while others report dirty water with lots of seaweed — conditions seem to vary a lot day to day.

A new report notes the north beach area in Nha Trang is currently experiencing low tide, with locals advising against staying there during this period — unclear if this is seasonal.

Travelers complain the public beach water looks murky for swimming and ask about cheap island ferries like Koh Larn in Pattaya — there isn't a real equivalent near Nha Trang, so it's better to just pick a different stretch of the mainland beach.

Asked about north vs south beach areas, locals suggest the southern part — water is generally cleaner there than closer to the center and river mouth.

One traveler walked the whole beach from the river southward looking for a proper toilet, shower and changing room — found only one shower and one toilet (which locals advised against using), and ended up swimming near their hotel instead. Tip: look for beach areas attached to hotels rather than public stretches.

After rain, the Cai River (Nha Trang has two rivers) washes clay from the mountains that colors the water, mostly affecting the central beach; in summer this is barely noticeable, so beach choice based on water color matters less then.

Drawing on experience in Turkey where a river mouth made the sea water murky, travelers asked whether to pick the southern beach over the central one in Nha Trang for the same reason — the answer is yes, water is cleaner further south from the river mouth.