contrib/gis/sample-data/polygons.tsv

1	POLYGON((0 0, 0 1, 1 1, 1 0, 0 0))
1	POLYGON((0 0, 0 -1, 1 -1, 1 0, 0 0))
2	POLYGON((10 10, 10 11, 11 11, 11 10, 10 10))
2	POLYGON((10 10, 10 9, 11 9, 11 10, 10 10))
2