Terrain context

Taiwan sits in the middle of a line of islands, and the gaps between them are the geography everyone else in the region is actually arguing about.

The first island chain from the Japanese south-west islands through Taiwan to the northern Philippines, and the channels between them.5 named chokepointsConfidence: ModerateStatus as of 2026-07Reviewed 2026-07-26

An arc of islands with navigable gaps at intervals — the Miyako Strait and the East China Sea approaches to the north, the Bashi Channel and Luzon Strait to the south. The arc separates semi-enclosed seas from the open Pacific, and the channels are the connections between them. Taiwan sits at the arc's hinge, which is a geographic fact rather than a claim about anyone's intentions.

A mountain range down the middle, everyone living on one side of it, and deep ocean on the other.

The island of Taiwan and the Pacific waters immediately east of it, extending to the Philippine Sea.5 named chokepointsConfidence: HighStatus as of 2026-07Reviewed 2026-07-26

A north–south central mountain range running most of the island's length, with peaks among the highest in East Asia, dropping steeply on the eastern side and giving way on the west to a broad alluvial plain. The plain carries almost the entire population, the major cities, the ports and the industry. The east is a narrow strip between mountains and sea, connected north–south by a small number of routes and to the west by a smaller number still.

A hundred and thirty kilometres of shallow, rough, heavily trafficked water, and an unwritten line down the middle of it that stopped working.

The Taiwan Strait between Fujian and western Taiwan, together with the approaches at its northern and southern ends.4 named chokepointsConfidence: HighStatus as of 2026-07Reviewed 2026-07-26

Open sea, unusually shallow for its width — much of the strait sits on continental shelf rather than deep water — and among the busiest commercial waterways in the world. Its width varies but is broadly comparable to the English Channel at four to five times over. The Penghu islands sit in the middle of it; Kinmen and Matsu lie against the mainland coast rather than the Taiwanese one.