Layer Estimates:

Layer: Arkansas Ports (ID:1)
Count: 10
Extent:

XMin: -94.355643477301
YMin: 33.0757732160363
XMax: -89.9557126581006
YMax: 35.7899194765828
Spatial Reference: 4326 (4326)

Layer: Navigation Locks (ID:2)
Count: 15
Extent:

XMin: -122.614393999583
YMin: 26.7217649998549
XMax: -73.6853229995567
YMax: 47.6657180001856
Spatial Reference: 4326 (4326)

Layer: Marine Highways (ID:3)
Count: 3
Extent:

XMin: -173.746484325991
YMin: -17.5550053916854
XMax: 145.980794182406
YMax: 72.1997196018782
Spatial Reference: 4326 (4326)

Layer: Waterway Network (ID:4)
Count: 68
Extent:

XMin: -180
YMin: -56.0221463884749
XMax: 180
YMax: 72.1997321461276
Spatial Reference: 4326 (4326)

Layer: Port Statistical Areas (PSA) (ID:5)
Count: 17
Extent:

XMin: -168.115323292851
YMin: 17.6234713599572
XMax: -64.5126717691732
YMax: 71.3401981219558
Spatial Reference: 4326 (4326)