The other dimensions are width and height or depth. It's 2 km wide at its widest point. It's at least 15 m deep within the shipping channel.

The river flows some 4000 km into the sea. The river winds its way for 4000 km into the sea. The river meanders for 4000 km into the sea The river has a length of 4000 km. The river zigs and zags for some 4000 km.

The river is 4000 M in length

The river is 4000 km miles away. Am I right