MANILA, Philippines - Thousands of cyclists rode through the streets of Metro Manila on Sunday, November 18, in this year's Tour of the Fireflies.

The 14th edition of the annual cycling event, which focused on "bicycles for environmentally sustainable transportation," saw cyclists ride through major thoroughfares in Pasig, Mandaluyong, San Juan, Quezon and Marikina cities.

FOR NATURE. Cycling enthusiasts participate in the 14th Tour of the Fireflies in Manila on November 18, 2012. AFP PHOTO/NOEL CELIS

Tiendesitas in Pasig City served as the starting and finishing point for the event.

Similar events were also held in Baguio City and in Palawan, according to organizers.

CYCLING FOR THE ENVIRONMENT. Cycling enthusiasts participate in the 14th Tour of the Fireflies in Manila on November 18, 2012. AFP PHOTO/NOEL CELIS

An estimated 12,000 riders, many also wearing costumes, joined the 38-kilometer ride. A short program, featuring musical acts who also advocate sustainable transportation, capped the event.

Here are some photos from the event, as tweeted by participants and those who saw the event along its route.

At Greenhills with @tiklopsocietyph for the #TouroftheFireflies twitter.com/aidenatapaz/st…

— Diane Zapata (@aidenatapaz) November 17, 2012

Yay! Thousands of bikers converged for 14th Tour of the Fireflies! #tourofthefireflies @padyakph twitter.com/theLakwatsero/…

— Lakwatsero (@theLakwatsero) November 18, 2012

Congratulations @fireflybrigade for another successful #TouroftheFireflies event! yfrog.com/oeydztcj

— Multiply (@shopatmultiply) November 18, 2012

From Erben Therese on Instagram (@erbentherese)

BIOMAN! #spotted #tourofthefireflies instagr.am/p/SJzN31Q6wo/

— Bj Villota (@beends) November 18, 2012

From @beends on Instagram

Rock for climate action, @abbyasistio @mikopepito & stephen domingo as hosts #tourofthefireflies yfrog.com/kjn0vcwj

— DAKILA Philippines (@dakila_ph) November 18, 2012

Final performer @tiktokpilipinas advocate, Cookie Chua of Color it Red! #tourofthefireflies yfrog.com/obwhlzqj

— DAKILA Philippines (@dakila_ph) November 18, 2012

This was the route participants took:

From www.fireflybrigade.org

- Rappler.com