Lake Erie?

Brief description of the issue:South shore of Lake Erie approx 25 miles East. Noticed this at FL20 down to 2k. Seemed to stretch for about 70 miles along the shore and out into the lake at least 20-30 miles. Flying CJ4, no mods. Just updated sim with Update 1/8/20.

Provide Screenshot(s)/video(s) of the issue encountered:

Detail steps to reproduce the issue encountered:

Hi @OctupleElm15084,
What you see here is realted to the spikes & mesh issue that has been addressed by the devs. Spikes on Terrain and and Mesh Problems - Global

Coastline/Shorelines have also been addressed and they have started working on it according to the feedback snapshot:
[BLOG] January 7th, 2021 Development Update - Community / News and Announcements - Microsoft Flight Simulator Forums

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Duplicate bug report.