Coastal morphometry has importance for water exchange and affects primary production potential, in that the bathymetric shape of a coastal area determines how much of the bottom area is reached by sunlight and hence is available for benthic primary production. In this paper, morphometric production potential, here defined as the bottom area above the Secchi depth, was assessed with the use of geographical information systems, morphometric data, and Secchi depth data, exemplified with data from the whole Swedish coast. The spatial distribution of ecologically important areas with high morphometric production potential was quite even along the Swedish coastline, but some regional differences were found. A linear relationship was found between the Secchi depth and the bottom area above the Secchi depth for the Swedish coast. An equation for calculation of the bottom area below/above a certain depth in lakes was used to calculate the area above the Secchi depth for 541 coastal areas, and the results were compared with the corresponding area values extracted from hypsographic data. This test yielded good correlation (r² = 0.87), and the equation was found to be useful also in coastal areas (e.g., when detailed hypsographs are not available).