Nong Khai is a long thin province running along the Mekong River, providing the main access to Laos. Originally people went by boat from Tha Sadet, but the building of the Friendship Bridge across the Mekong has made Nong Khai a major centre for transport and trade with Laos. Attractions include Wat Pho Chai, renowned for its large seated Buddha believed to have been cast in Lan Chang, and Phra That Nong Khai, an old chedi that slipped into the river and can now only be seen completely in the dry season.