Snagly,
I've fished the Sinapore River back in 1972 right by the dragon fish statues at the end of the river where it comes into the harbor. Didn't see any Steelhead though. Went to a store bought a hand line and some bait. Can't remember what I caught but the locals sure like me giving them the fish. Great fly fishing to the North in Maylaisia.
There are bone fish on the small flats and around the mangroves.