Which province has the largest land area in China? Note: it's land area, not land area. I know it's Xinjiang

Which province has the largest land area in China? Note: it's land area, not land area. I know it's Xinjiang

Xinjiang is the largest province in China, accounting for one sixth of the total area
If the sea area is also included, Hainan Province is more than 400000 km2 larger than Xinjiang Uygur Autonomous Region, which is the largest province in China