The LDS Church's Meridian Idaho Temple — which opens this week — is located 8.8 miles from the Boise Idaho Temple. That distance is measured in "geodesic" miles — the distance between two points on a map, similar to the term "as the crow flies."
It's among the shortest distances between two temples of The Church of Jesus Christ of Latter-day Saints — certainly the shortest outside the state of Utah, where six distances between temples measure even less.
Note: LDS temples cited are those as of October 2017 that are operating, under construction or announced with an official site determined, unless noted. Click here for a similar listing in kilometers.

6 shortest distances between Utah temples
2.4 miles — Provo to Provo City Center
3.1 miles — Jordan River to Oquirrh Mountain
6.8 miles — Draper to Jordan River
8.0 miles — Draper to Mount Timpanogos
8.1 miles — Bountiful to Salt Lake
8.6 miles — Draper to Oquirrh Mountain

4 other distances under 15 miles between Utah temples
11.3 miles — Mount Timpanogos to Provo
12.5 miles — Mount Timpanogos to Provo City Center
14.3 miles — Jordan River to Salt Lake
14.7 miles — Jordan River to Mount Timpanogos

Outside Utah: Distances between temples under 10 miles8.8 miles — Boise to Meridian9.6 miles — Gilbert to Mesa
Outside the U.S.: Potential distances between temples under 20 miles
12 miles — Lima to Lima Los Olivos *
13 miles — Manila to Greater Manila *
- Lima Los Olivos and Greater Manila temple sites have not been announced; mileage figured from existing temples is Lima and Manila to the center of the Los Olivos and Alabang areas of the respective metro areas)

Outside Utah: Nearest temples less than 100 miles
25.2 miles — Idaho Falls to Rexburg
28.3 miles — Mesa to Phoenix
37.7 miles — Gilbert to Phoenix
44.4 miles — Idaho Falls to Pocatello
44.5 miles — Los Angeles to Newport Beach
49.9 miles — Newport Beach to Redlands
63.7 miles — Newport Beach to San Diego
64.1 miles — Denver to Fort Collins
69.5 miles — Pocatello to Rexburg
74.0 miles — Los Angeles to Redlands
76.0 miles — Pocatello to Star Valley
76.6 miles — Gila Valley to Phoenix
78.0 miles — Idaho Falls to Star Valley
79.0 miles — Oakland to Sacramento
80.2 miles — Gilbert to Tucson
81.9 miles — Redlands to San Diego
84.0 miles — Manhattan to Philadelphia
87.0 miles — Rexburg to Star Valley
89.0 miles — Hartford to Manhattan
89.8 miles — Mesa to Tucson
93.2 miles —Reno to Sacramento
96.9 miles — Boston to Hartford

Outside the U.S.: Nearest temples less than 200 miles
50.8 miles — Campinas Brazil to São Paulo Brazil
72.9 miles — Guatemala City Guatemala to Quetzaltenango Guatemala
85.4 miles — Tuxtla Gutiérrez Mexico to Villahermosa Mexico
103.7 miles — Guatemala City Guatemala to San Salvador El Salvador Mexico
137.1 miles — San Salvador El Salvador to Tegucigalpa Honduras
137.7 miles — Ciudad Juárez Mexico to Colonia Juárez Chihuahua Mexico
139.1 miles — Buenos Aires Argentina to Montevideo Uruguay
140.3 miles — Calgary Alberta to Cardston Alberta
150.0 miles — Oaxaca Mexico to Veracruz Mexico
154.1 miles — Port-au-Prince Haiti to Santo Domingo Dominican Republic
164.7 miles — Calgary Alberta to Edmonton Alberta
170.6 miles — Quetzaltenango Guatemala to Tuxtla Gutiérrez Mexico
173.5 miles — Quetzaltenango Guatemala to San Salvador El Salvador
188.6 miles — London England to Paris France
190.9 miles — Colonia Juárez Chihuahua Mexico to Hermosillo Sonora Mexico
195.7 miles — Mexico City Mexico to Veracruz Mexico

Most remote temples (from one temple to the nearest temple)
1,449.4 miles — Papeete Tahiti to Apia Samoa
1,338.0 miles — Anchorage Alaska to Vancouver British Columbia
1,326.2 miles — Perth Australia to Adelaide Australia
1,283.5 miles — Hamilton New Zealand to Nuku’alofa Tonga
1,044.6 miles — Manaus Brazil to Caracas Venezuela852.7 miles — Kinshasa Democratic Republic of Congo to Aba Nigeria712.9 miles — Kyiv Ukraine to Helsinki Finland

Farthest distance between temples
12,379.0 miles — Asunción Paragua to Taipei Taiwan
12,248.1 miles — Hamilton New Zealand to Madrid Spain
12,192.7 miles — Hamilton New Zealand to Lisbon Portugal
12,187.0 miles — Montevideo Uruguay to Seoul Korea
12,175.3 miles — Fukuoka Japan to Porto Alegre Brazil
12,091.7 miles — Cochabamba Bolivia to Hong Kong China
12,074.8 miles — Buenos Aires Argentina to Seoul Korea
12,055.9 miles — Fukuoka Japan to Montevideo Uruguay
Cities with more than one LDS temple
2 — South Jordan, Utah (Jordan River, Oquirrh Mountain)
2 — Provo, Utah (Provo, Provo City Center)
U.S. metropolitan areas with more than one LDS temple
(Metropolitan statistical areas as defined by federal government's Office of Management and Budget)
5 — Provo-Orem (Mount Timpanogos, Payson, Provo, Provo City Center, Saratoga Springs*)
4 — Salt Lake City (Draper, Jordan River, Oquirrh Mountain, Salt Lake)
3 — Ogden-Clearfield (Bountiful, Ogden, Brigham City)
3 — Phoenix (Gilbert, Mesa, Phoenix)
2 — Boise (Boise, Meridian)
* Temple has been announced, but a site has not been officially designated
International metro areas with more than one LDS temple
2 - Lima, Peru (Lima, Lima Los Olivos*)
2 - Manila, Philippines (Manila, Greater Manila*)
* Temple has been announced, but a site has not been officially designated