Wei-hai-wei, a city in a deep bay on the Shantung promontory, China, 40 m. E. of Chefoo, and nearly opposite Port Arthur, which is situated on the northern side of the entrance to the Gulf of Pechili; was leased to Great Britain in 1898, along with the islands in the bay and a belt of land along the coast; its harbour is well sheltered, and accommodates a large number of vessels.