Karst is a type of landscape where the dissolving of the bedrock has created sinkholes, sinking streams, caves, springs, and other characteristic features.
Click images to enlarge. The honey locust tree, or honeylocust, is a fast grower and is considered invasive by some. Flowers are not especially showy. The honeylocust tree is so named because of the taste of the inner flesh of its pods, which appear in fall and unlike the black locust tree, is not toxic.
Or it may have thorns on its twigs only, or on its twigs and trunk. Sometimes the thorns form clusters on the trunk simular to witch's broom. The thorns on honey locust can get quite long. Those on the twigs usually are 1+ long, single, and placed in a ziz-zag pattern. The ones on the trunk can be compound.