The Sand Pebbles - Steve McQueen (1966) - Tolo Channel, Tai Po

The fact that we now know that the film crew made the effort to take the purpose built (but flat bottomed) boat San Pablo around the Sai Kung peninsula and into Tolo Channel - because that's the only way you can get to Three Fathoms Cove - means that it is highly likely some scenes were also filmed around the Tolo Channel area itself. And so it turns out to be because there is this shot showing the boat moving "down river" when it is in fact heading out to sea along the channel.

How do we know? Look in the distance (2nd and 3rd pictures) and you can see Port Island lying at the eastern entrance to Tolo Channel. The headland in the background is all part of Plover Cove Country Park.

 You can also see Port Island in background of this shot as McQueen comes out of the cabin.