Photos: 2012 Ironman World Championship 70.3

A good chunk of the bike takes place in the Lake Mead National Park.

The water at Lake Las Vegas was a warm 82 degrees F.

The sun rose as the pro athletes entered the water to kick off their 70.3-mile day.

An age-group wave saves some energy before taking to Lake Las Vegas.

Kelly Williamson has been working on her bike.

2010 70.3 world champ Jodie Swallow had a big lead coming out of the swim and onto the bike course.

A few pro men commented on the large size of the main pack.

Crowie takes his turn at the front of the train.

Australia's Richie Cunningham has been having his most successful season to date.

The ride back to Henderson takes athletes past the Lake Las Vegas property.

Cave said after the race she was surprised by how quickly she found the front spot on the bike.

Heather Jackson has been working on the bike/run balance.

Crowie and the rest of the pro men spent the entire run trying to cut time into Sebastian Kienle's lead.

Andy Potts was part of the first chase pack off of the bike.

Leanda Cave stayed out front for the entire half marathon.

Sebastian Kienle earns his first world championship title.

Sebastian Kienle came off of the bike with a three-minute lead and he wasn't willing to give up too much of his lead on the run.

Eventual winner Leanda Cave.

Eventual winner Leanda Cave.

Eventual winner Leanda Cave.

Eventual winner Leanda Cave.