The Ayn Zayanah-Al Coeffiah (synonym Al-Kweifiya) area is part of Al Jabal Al Akhdar in the northeast Benghazi city. The Miocene Benghazi Formation is the dominant lithology. It is affected by numerous karstic features (dolines and conduits) such as Hawa Buhmira, Eftimah and Al Majdoub lakes, as well as the Hawa Al Mirisi, and Hawa Bu Karmah caves. Detailed mapping and structural analysis in the conduit system and surrounding dolines indicated the passage pattern dominated by NW–SE to NE–SW and N to S oriented faults also the orientation of all dolines long axes are NW–SE, N–S, and NE–SW which is parallel to the regional fault systems of the Central-Western parts of Al Jabal Al Akhdar. The fault movement induced zones of broken and crushed rocks which increase dissolution and form small-scale karstic features. Here, the collected water on the surface for considerable time to be penetrating into the ground water through cavities leading to further stages of karstification. This separates the rock masses by free surface expansion due to stress relief and enlarged joints and faults followed by roofs collapsing and formation of the present dolines. This process of karstification plays a significant role in forming hydraulic connections between aquifers and seawater. This intrusion will increase whenever the groundwater is heavily-pumped through the Benghazi plain karstic systems. The coastal spring (Ayn Zayanah) is the main natural outlet of a wide catchment zone known as the Benghazi Groundwater Basin that discharges into the Blue Lagoon ended into the sea.

Ayn Zayanah-Al Coeffiah（同义词 Al-Kweifiya）地区是班加西市东北部 Al Jabal Al Akhdar 的一部分。中新世班加西组是主要的岩性。它受到众多岩溶特征（水槽和管道）的影响，例如 Hawa Buhmira、Eftimah 和 Al Majdoub 湖，以及 Hawa Al Mirisi 和 Hawa Bu Karmah 洞穴。管道系统和周边天沟的详细绘图和结构分析表明，以NW-SE到NE-SW和N到S方向的断层为主的通道模式，所有天沟长轴的方向都是NW-SE、N-S和NE -SW 与 Al Jabal Al Akhdar 中西部的区域断层系统平行。断层运动诱发碎石带，增加溶蚀作用，形成小规模岩溶特征。这里，在地表收集的水在相当长的时间内通过洞穴渗透到地下水中，导致进一步的岩溶作用阶段。这通过由于应力释放和扩大的节理和断层而导致的自由表面膨胀分离岩体，随后屋顶坍塌并形成目前的天坑。这一岩溶作用过程在含水层和海水之间形成水力连接方面起着重要作用。每当地下水通过班加西平原岩溶系统大量抽取时，这种入侵就会增加。沿海泉水 (Ayn Zayanah) 是被称为班加西地下水盆地的广阔集水区的主要天然出口，流入蓝色泻湖并最终流入大海。