Landscape Culling Issue

Hey there! So I’m having a problem with rendering out a landscape using a height map from World Machine. Every single time I look out into the horizon near the ground, the landscape flickers out of existence, whereas if I look at it from above, the landscape appears. Panning the camera demonstrates how each section of the landscape culls alongside the camera, and despite having extended both the Zbounds in the positive and negative direction, nothing seems to work so that, at eye level, the entire landscape appears as it does to scale (I have roughly a 4km x 4km map). If anyone has any suggestions, it would be very much appreciated!