河内 (Hé nèi) — Hanoi (capital of Vietnam)

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

河 pairs 水 (water) with 何, which gives the sound. The 水 part marks it as a word for a river.

Two or more meaningful parts placed together so that their meanings combine into a new one.

The shape shows 入 entering into 冂, a house, so it pictures bringing something indoors, giving the sense inside.