Mont Saint-Michel, France

Postcard US-3133043 from Texas was a French postcard the sender collected during a trip to
Mont Saint-Michel in Normandy, France. Located 1 kilometer  or 0.6 miles off shore at the mouth of the Couesnon River, the tidal island is 100 hectares or 247 acres in size with only 44 official residents in 2009. However, as part of the UNESCO World Heritage Site, it has more than 3 million visitors each year.

Ten thousand visitors to the island got to see a supertide this Saturday on March 21, 2015, caused by the so-called supermoon effect coinciding with Friday’s total solar eclipse on March 20, 2015. Said to rise at the pace of a horse’s gallop, the unusual high tide turned the Mont briefly into an island fully surrounded by the English Channel Saturday. Normally, at a low tide visitors could walk on the vast flat seabed, while at high tide visitors could still travel to/from the mainland by a narrow causeway. The rare phenomenon supertide occurs every 18 years.

In Mount's Bay, Cornwall, United Kingdom, St Michael's Mount was a Cornish counterpart of Mont Saint-Michel in France, with the same tidal island characteristics and a similar conical shape,

Supermoon

Full Moon at Flamingo Hotel, Las Vegas

The expired postcard US-1895485 was sent to Netherlands on October 2, 2012. It shows a full moon over the Flamingo Hotel on September 30, 2012.

On Sunday, June 23, 2013 at 4:32 am PDT (11:32 UTC / 7:32 am EDT), the moon was at its perigee point, the point in the moon orbit that is closest to the center of the earth. Whenever that happens as the moon also enters its fullest phase, it creates a coincidence called "supermoon". At its fullest and closest, the moon appears about 12% larger in the sky.

In the middle of the picture shows the supermoon in the evening of June 22, 2013 while on the right shows a full moon on September 30, 2012. The difference between the two is shown on the left.

The previous two supermoons happened on March 19, 2011 and on May 6, 2012. The next superMoon will be on August 10, 2014. 

I wish I were in Alaska so that I could see the supermoon in the midnight sun. You can see photos of the supermoon at Huffington Post, Baltimore Sun, EarthSky.ORG and Space.COM.