Get borders navmesh

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Hi! I want to get edges or points of navmesh. I need a start and an end of navmesh. How can I to do it?

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I found solution.
I use function FindDistanceToWall.

const UNavigationSystemV1* NavSys = FNavigationSystem::GetCurrent<UNavigationSystemV1>(this);
const ARecastNavMesh* NavMesh = Cast<ARecastNavMesh>(&NavSys->GetMainNavDataChecked());
const float DistWall = NavMesh->FindDistanceToWall(NavLocation);