Travelmath provides a database of major and local cities around the world. You can find the latitude and longitude of any world city, and check the city distance by comparing the flight distance between cities with the driving distance to see how far two cities are from each other.
Whorled phyllotaxy. Whorled phyllotaxy is another common mutation, although this is less desirable as a concealment trait as the plants still definitely resemble cannabis.
A common nymphing and general overall fly fishing technique that even beginners can master is a dead drift or tight line fishing technique, casting directly across the river, letting the fly line drift downriver while keeping any slack out of the line.