question: In addition to the New Haven Harbor , what additional natural element is a prominent geographic feature of the area , flanking the northeast and northwest boundaries ?
answer: basalt trap rock ridges
turker_answer: In addition to the New Haven Harbor , basalt trap rock ridges are a prominent geographic feature of the area , flanking the northeast and northwest boundaries .
rule-based: In addition to the New Haven Harbor , basalt trap rock ridges is a prominent geographic feature of the area , flanking the northeast and northwest boundaries .