The Bar Lev Line was a chain of fortifications built by Israel

Israel

The State of Israel is a parliamentary republic located in the Middle East, along the eastern shore of the Mediterranean Sea...

 along the eastern coast of the Suez Canal

Suez Canal

The Suez Canal , also known by the nickname "The Highway to India", is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea and the Red Sea. Opened in November 1869 after 10 years of construction work, it allows water transportation between Europe and Asia without navigation...

 after it captured the Sinai Peninsula

Sinai Peninsula

The Sinai Peninsula or Sinai is a triangular peninsula in Egypt about in area. It is situated between the Mediterranean Sea to the north, and the Red Sea to the south, and is the only part of Egyptian territory located in Asia as opposed to Africa, effectively serving as a land bridge between two...

 from Egypt

Egypt

Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

 during the 1967 Six-Day War

Six-Day War

The Six-Day War , also known as the June War, 1967 Arab-Israeli War, or Third Arab-Israeli War, was fought between June 5 and 10, 1967, by Israel and the neighboring states of Egypt , Jordan, and Syria...

.
The Bar Lev Line evolved from a group of rudimentary fortifications placed along the canal line. In response to Egyptian artillery bombardments during the War of Attrition

War of Attrition

The international community and both countries attempted to find a diplomatic solution to the conflict. The Jarring Mission of the United Nations was supposed to ensure that the terms of UN Security Council Resolution 242 would be observed, but by late 1970 it was clear that this mission had been...

, Israel developed the fortifications into an elaborate defense system spanning 100 miles (160.9 km) along Suez Canal, with the exception of the Great Bitter Lake

Great Bitter Lake

The Great Bitter Lake is a salt water lake between the north and south part of the Suez Canal. It is adjoined by the Small Bitter Lake . Before the Canal was built, their site was occupied by dry salt valleys. Together, the Bitter Lakes now have a surface area of about 250 km²...

 (where a canal crossing was unlikely due to the width of the lake).