Hoan Kiem Lake

Hoan Kiem Lake (Vietnamese: Hồ Hoàn Kiếm, Hán tự: 湖還劍, meaning "Lake of the Returned Sword" or "Lake of the Restored Sword"), also known as Hồ Gươm (Sword Lake), is a fresh water lake, measuring some 12 ha in the historical center of Hanoi, the capital city of Vietnam. In the past, the lake was variously name "Luc Thuy Lake" (Vietnamese: Hồ Lục Thủy, meaning "Green Water Lake" - aptly named for the water's color) or "Thuy Quan Lake" (Vietnamese: Hồ Thủy Quân, meaning "Mariner's Lake").

Hanoi (UK: ha-, hə-NOY or US: hah-NOY; Vietnamese: Hà Nội [hàː nôjˀ] (listen)) is the capital and one of the five municipalities of Vietnam. It covers an area of 3,328.9 square kilometres (1,285 sq mi). With an estimated population of 7.7 million as of 2018, it is the second largest city in Vietnam.

St. Joseph's Cathedral (Vietnamese: Nhà thờ Lớn Hà Nội, Nhà thờ Chính tòa Thánh Giuse; French: Cathédrale Saint-Joseph) is a church on Nha Chung (Church) Street in the Hoàn Kiếm District of Hanoi, Vietnam. Its a late 19th-century Gothic Revival (Neo-Gothic style) church that serves as the cathedral of the Roman Catholic Archdiocese of Hanoi to nearly 4 million Catholics in the country.

Turtle Tower (Vietnamese: Tháp Rùa/塔𪛇), also called Tortoise Tower is a small tower in the middle of Sword Lake, Hanoi, Vietnam.

The Temple of the Jade Mountain (Vietnamese: Đền Ngọc Sơn) is located on Hoàn Kiếm Lake in central Hanoi, Vietnam.

Hoàn Kiếm (Hán tự: 郡還劍; Sino-Vietnamese for Returned Sword) is an urban district (quận) of Hanoi, the capital city of Vietnam, named after the scenic Hoàn Kiếm Lake. The lake is in the heart of the district and serves as the focal point of the city's public life. The majority of tourist attractions in Hanoi are also located in the district.