Layer Estimates:

Layer: World Cities (ID:0)
Count: 593
Extent:

XMin: -18397772.7190125
YMin: -7007701.38135577
XMax: 19718042.3309723
YMax: 14476655.3016421
Spatial Reference: 102100 (3857)

Layer: rivers (ID:1)
Count: 98
Extent:

XMin: -18355185.4542083
YMin: -4434848.73294723
XMax: 17896121.6043357
YMax: 11537827.6521526
Spatial Reference: 102100 (3857)

Layer: World Continents (ID:2)
Count: 8
Extent:

XMin: -20037507.0671618
YMin: -30240971.9583861
XMax: 20037507.0671618
YMax: 18418382.3289231
Spatial Reference: 102100 (3857)