A shoal is a somewhat
linear landform within or extending into a body of
water, typically comprised of
sand,
silt or small
pebbles. Alternatively termed sandbar or sandbank, a bar is characteristically long and narrow (linear) and develops where a stream or
ocean current promote
deposition of
granular material, resulting in localized shallowing (shoaling) of the water. Bars can appear in the
sea, in a
lake, or in a
river. They are typically composed of
sand, although could be of any granular matter that the moving water has access to and is capable of shifting around (for example,
soil,
silt,
gravel,
cobble,
shingle, or even
boulders). The
grain size of the material comprising a bar is related to the size of the waves or the strength of the currents moving the material, but the availability of material to be worked by waves and currents is also important.
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