The lower Ganges–Brahmaputra–Meghna system is a useful starting point. Broad channels, sandbars, cultivated floodplains, and the tidal creeks of the Sundarbans occupy much of the regional view. Channel widths and exposed bars change with river flow, so images from different seasons may look quite different.
Checking the location
Follow a major channel toward the Bay of Bengal. Separate the branching coastal channels from the wider inland river network. The Sundarbans extends into India, and much of the plain continues across the border; a green delta landscape alone cannot place you on the Bangladeshi side. The hills in the southeast provide a contrasting feature, but hill country also occurs elsewhere in the surrounding region.