When did sea level reach its highest point before the modern level during the last interglacial period?

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Map showing the extent of the Laurentide, Cordilleran, and Greenland ice sheets during the Wisconsin glaciation, roughly 100,000 to 11,000 years ago. The Laurentide Ice Sheet covers most of present-day Canada and parts of the northern United States in light blue, the Cordilleran Ice Sheet covers the Pacific Northwest in teal, and the Greenland Ice Sheet is marked in purple. Modern international and state or provincial boundaries are outlined for reference. — Pleistocene Epoch Ice sheets during the Wisconsin glacial episode penetrated deep into North America.

The highest sea level prior to the modern era occurred approximately 125,000 years ago during the peak warm interval of the last interglaciation, known as oxygen-18 stage 5e. At that time, the sea level was about 6 metres (19.6 feet) higher than it is today.1