The city is the provincial administrative center of Hainan as well being the focus of the local economy, culture and transportation. Haikou stands at the northern end of Hainan Island, on the west bank of the Nandu River estuary. This river is the longest on the island and the city's name appropriately means 'Mouth of the Sea'. With the sea on three sides Haikou enjoys a long coastline that features excellent bathing beaches and sea side resorts. Holiday Beach is the most popular of these, while Xixiu Beach is where the National sailing and windsurfing teams train and hold competitions.