Vrilissia (Greek: Βριλήσσια) is a suburban municipality of the North Athens regional unit, in the Attica region. It is located in the Athens basin, at the southwestern foot of the Penteli Mountain. The administrative limits of the municipality extend from the Chalandri gully up to foothills of the Penteli, known as Patima and Koufos Hills. Vrilissia lies approximately 10 kilometers (6 miles) north-east of the center of the Greek capital and 5 kilometers (3 miles) northwest of the city of Pallini, center of East Attica. The area of the Vrilissia municipality is 3.856 square kilometers (1.489 square miles).
Among the municipality's features, one notices the low rise profile with four apartment floors maximum at the center, while particularly high is also the rate of private gardens. The center of the municipality is built up around the Analipseos Main Church (Jesus Christ's Ascension Church), while the commercial area mainly extends throughout the Penteli Avenue. The municipality is generally composed of residents among the median and upper-income bands.
The municipality is connected with all urban and suburban means of transport of Attica. The Athens northern beltway Motorway 6 and the short Motorway 642 pass through the municipality. It is served by two commuter railway stations (Doukissis Plakentias station and Pentelis station) and a metro station (Doukissis Plakentias). Several (and relatively frequent) buses serve destinations to neighboring suburbs as well as the center of Athens. The main thoroughfare is Pentelis Avenue, which connects Vrilissia with Chalandri and central Athens.