The phrase refers to a landscape or terrain that has uneven or irregular features due to sagging and selling, indicating instability or degradation.

अस्थिर या घटते स्थिरता के कारण असमतल या अनियमित भूभाग

English Usage: The sag and sell topography of the old mining town was evident as soon as we entered the area.

Hindi Usage: पुराने खनन शहर की झुकना और बिकना भूआकृति क्षेत्र में प्रवेश करते ही स्पष्ट थी।