 Complete the following phrase:  The long-running dispute arose from the 1934 Treaty of Taif between Yemen and the newly-formed Saudi Arabia and the subsequent demarcation of the boundary three years later. Ambiguity in the placement of the border led to competing claims by Saudi Arabia and Yemen for the remainder of the twentieth century, complicated by traditional pre-colonial claims, crude border-marker placement and uncertainty as to the exact mountain peak named in the original treaty text. Two wars were fought over the border: 