The Cả pass (Đèo Cả) is a mountain pass in Phú Yên Province, Vietnam. The mountains are known as the Cả pass mountains (núi Cả Đèo). Historically, the Cả Pass was the second most difficult col in Vietnam after Hải Vân Pass.Vietnam economic times: Volume 159 Viện kinh tế thế giới (Vietnam) "Located on a granite block of around 20,000 hectares with the highest mount standing at more than two kilometres above the sea, Ca Pass was the second most difficult col in Vietnam, after Hải Vân Pass. To the north. Da Bia Mountain stood ..." In 1611, the Nguyen lords pushed their border down to Cả Pass.Views of seventeenth-century Vietnam: Christoforo Borri Page 21 Olga Dror, Keith Weller Taylor, Cristoforo Borri - 2006 "In 1611, the Nguyen pushed their border down to Ca Pass to include the modern province of Phú Yên. "
The pass is also known as Đèo Cục Kịch.Đèo Cả . Phú Yên Online, 12/06/2007. In the French documents the pass name is "Col Babonneau".Col Babonneau (Phong So) / Vietnam (general). getamap.net, 2015. Phong So is Phong Sổ hamlet of Hòa Xuân Nam commune.
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