Toward the coast; in the direction of coastal areas (British variant of coastward).
Same root as 'coastward' with an added '-s' suffix common in British English adverbial forms. Both 'coastward' and 'coastwards' have been used interchangeably since the 19th century.
British English loves adding that extra 's' to directional words—'towards' instead of 'toward', 'backwards' instead of 'backward'—making the words flow more smoothly when spoken!
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