Plains tiles are brownish and have 1

1

. Generally ignore plains because they only provide 1 food. Grassland tiles are the green tiles and give 2

. Tiles are "riverside" if they are directly adjacent to a river. Being a riverside tile gives 1

in addition to the base yield. So, a riverside plains gives 1

1

1

, and a riverside grassland tile gives 2

1

. The tiles with the bright green jungle are also grassland tiles. When a jungle is on a tile, it removes 1

. Jungles also remove the 1

if a tile is riverside. After chopping the jungles, the tile will yield 2 food and a commerce if the tile is riverside. sampsa is suggesting to farm 3-4 riverside grassland tiles and cottaging the rest of the grassland.