What is in this image? Describe it as if you were explaining it to someone from the 15th century.

This image depicts a large watercraft, akin to the grand vessels you may have heard of from far-off lands, but much more massive and constructed of solid, seemingly impenetrable materials, unlike our wooden ships. This vessel is not powered by sails or oars but rather by mechanisms hidden within, evidenced by the large cylindrical structures atop its deck from which smoke belches. This ship, enclosed in its fortified hull, appears to have run aground upon a river bank or a shallow part of a lake, surrounded by a stark and simple landscape with distant mountains and scattered trees. The scene is peaceful yet poignant, as the mighty ship rests awkwardly upon the earth, far from the open waters it is meant to traverse.