Salinity and oxygen (in % oxygen saturation) in the Baltic Sea. The North Sea is on the left, beyond the shallow sills of the Belt Sea between Sweden and Denmark where the depth is only 30 m or less. High salinities in the west indicate inflow of salty water from the North Sea. Note the rapid transition from salinities higher than 25 to salinities below 10 in the Belt region. Further east the Baltic Sea has very low salinity. (The broken line is the 7.5 isohaline.)

Oxygen levels are close to or above saturation in the upper 50 m but get very low in the deeper layers. (The broken line is the 20% saturation contour.) Note the rapid decline of oxygen saturation near 100 m depth.

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