WINDHAM – This city, populated by 23 million people, is located in a humid subtropical climate at the mouth of the Yangtze River. The people speak Mandarin and Wu Chinese, and practice Taoism and Buddhism. They ride a high-speed train that can move at speeds of up to 268 miles per hour.

Got it?

If not, you might consider brushing up on your geography with Donna Morton’s fourth graders at the Manchester School. Every week, her class investigates a series of cultural, climatic, demographic and longitudinal clues in a game called, “Where in the World is Mr. Day?” and according to Morton, everyone is invited to participate online, adults included.

By the way, the answer is Shanghai.

Mr. Day (first name: Kevin) is a pilot for the United Parcel Service, and the father of Audrey, a student in Morton’s class. Day spends 170 days of the year delivering goods including the first iPhone shipment from China to the United States to 25 different countries.

When he’s out of town, Day sends Morton 10 or 11 clues hinting at his whereabouts. The students, who completed a more traditional geography unit in October, have a few days to figure out Day’s location, with the aid of Google Earth and other Internet tools. (Morton is a passionate advocate of digital education.) After the answer is unveiled he’s recently been to Dubai, Anchorage, Louisville, Honolulu, San Francisco, Sydney, and Seoul the students are graded on effort, not accuracy. But the “first guessers” are acknowledged on Morton’s website, where she posts roughly two sets of clues a week.

Day has done this before. When Aiden, 12, his oldest child, was in fourth grade, he sent in clues about his whereabouts for the original “Where in the World is Mr. Day?”

But this year’s version has a twist, beyond the fact that it’s Audrey’s turn. In previous years, Morton has utilized a stuffed moose, Marco, to teach her students about the geography of Maine.

With Morton’s permission, Day has temporarily commandeered Marco. On the “Where in the World is Mr. Day?” bulletin board in the corner of the schoolroom, Morton has posted Day’s pictures of Marco in front of the Golden Gate Bridge and the Dubai Tower.

Day has been interacting with his children’s classes for years.

“I’ve been going into school and talking to the children about my job since my son was in preschool,” Day wrote, in an email. “Kids love airplanes and it’s fun for me to share my passion with them. When the kids are young, like my daughter Karly is now, I start out sending them postcards and eventually come into their class and read books about airplanes. As the kids have gotten older I’ve tried to make it more educational. I fly to Asia often, so one of the things I like to do is go into the classroom and teach the kids how to eat with chopsticks you would be surprised how quickly they pick it up.”

Audrey says it’s boring when her dad is away. She likes seeing the clues in class, even though she sometimes knows the answers beforehand.

“I think it’s pretty cool,” she said.

Morton said she half-seriously asked Day if he would take the class on a flight.

“I asked him if he would do a charter flight for us, and he said that his boss probably wouldn’t like to have 22 fourth graders loaded on his plane with his packages,” she said.

But there is time yet for further persuasion. Day plans to send in clues for the remainder of the school year.

“I love to engage with the children, and my job makes that easy,” he said. “Airplanes are cool. Traveling and visiting other countries and cultures is cool. I’ve learned so much with my job and love the opportunity to share it with the kids. Knowing that I can add to what Mrs. Morton is teaching the children is rewarding.”

Donna Morton and her students communicate with Kevin Day via Skype.On business in Seoul, South Korea, UPS pilot Kevin Day communicates with his daughter’s fourth grade class via Skype.