Sure looks like an reef

This HRTM of the St. Petersburg peninsula of Florida reveals its topography to resemble uplifted reefs. The resolution is 1 meter horizontal and ~6 cm vertical, sourced from the USGS NED FL_Peninsular_2018_D18 dataset. The color ramp employed cycles every 10 meters, and shows the entire peninsula's bare-earth topography is at less than 20 meters above sea level. The USGS and local government shareholders are motivated to generate these elevation data to assist in the identification of flood-prone areas with a high degree of fidelity.