Unlike larger inlets such as Knight or Bute, it is not flanked by mountains but by relatively low, but still rugged, coastal hill-country and forms a maze of complex, narrow waterways and tidal pools and lagoons.

It is located within a corresponding maze of peninsulas on the mainland on the northwest side of the Queen Charlotte Strait region.

Its main arm is 75 km (47 mi) in length from the mouth of the Seymour River to the mouth of its north arm, Belize Inlet, which is about 50 km (31 mi) in length and has its own side inlets, narrow waterways named Wentworth Sound and Alison Sound.

Seymour Inlet does not open directly onto the Queen Charlotte Strait but is accessed via Slingsby Channel and Schooner Channel, which are the passages on either side of Bramham Island.

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