public function get_venues_in_geofence( $lat, $lng, $geofence_radio = null ) {

		$lat = floatval( $lat );

		if ( empty( $geofence_radio ) ) {
			$geofence_radio = $this->get_geofence_size();
		}

		// get the limits of the geofence

		$maxLat = $lat + rad2deg( $geofence_radio / self::EARTH_RADIO );
		$minLat = $lat - rad2deg( $geofence_radio / self::EARTH_RADIO );
		$maxLng = $lng + rad2deg( $geofence_radio / self::EARTH_RADIO / cos( deg2rad( $lat ) ) );
		$minLng = $lng - rad2deg( $geofence_radio / self::EARTH_RADIO / cos( deg2rad( $lat ) ) );

		$latlng = array(
			'lat'    => $lat,
			'lng'    => $lng,
			'minLat' => $minLat,
			'maxLat' => $maxLat,
			'minLng' => $minLng,
			'maxLng' => $maxLng,
		);

		/**
		 * Allow overriding of Venues query by returning an array of Venue IDs.
		 *
		 * @since 4.4.16
		 *
		 * @param null|int[] $venues Venue IDs, default null will query database directly.
		 * @param array      $latlng {
		 * 		Latitude / longitude values for geofencing
		 *
		 *		@type float $lat    Central latitude point
		 *		@type float $lng    Central longitude point
		 *		@type float $minLat Minimum latitude constraint
		 *		@type float $maxLat Maximum latitude constraint
		 *		@type float $minLng Minimum longitude constraint
		 *		@type float $maxLng Maximum longitude constraint
		 * }
		 * @param float      $geofence_radio Geofence size in kilometers
		 */
		$venues = apply_filters( 'tribe_geoloc_pre_get_venues_in_geofence', null, $latlng, $geofence_radio );

		if ( null === $venues ) {
			global $wpdb;

			// Get the venues inside a geofence
			$sql = "
				SELECT DISTINCT venue_id FROM (
					SELECT coords.venue_id,
						   MAX( coords.lat ) AS lat,
						   MAX( coords.lng ) AS lng
					FROM (
						SELECT post_id AS venue_id,
							CASE
								WHEN meta_key = %s
								THEN meta_value
							END AS lat,
							CASE
								WHEN meta_key = %s
								THEN meta_value
							END AS lng
						FROM $wpdb->postmeta
						WHERE
							meta_key = %s
							OR meta_key = %s
					) AS coords
					INNER JOIN $wpdb->posts p
						ON p.id = coords.venue_id
					WHERE
						(lat > %f OR lat IS NULL)
						AND (lat < %f OR lat IS NULL)
						AND (lng > %f OR lng IS NULL)
						AND (lng < %f OR lng IS NULL)
						AND p.post_status = 'publish'
						AND p.post_type = %s
					GROUP BY venue_id
					HAVING
						lat IS NOT NULL
						AND lng IS NOT NULL
				   ) AS query
			   ";

			$sql = $wpdb->prepare(
				$sql,
				array(
					self::LAT,
					self::LNG,
					self::LAT,
					self::LNG,
					$minLat,
					$maxLat,
					$minLng,
					$maxLng,
					Tribe__Events__Main::VENUE_POST_TYPE,
				)
			);

			$venues = $wpdb->get_col( $sql );
		}

		// Return null if $venues is empty
		if ( empty( $venues ) ) {
			$venues = null;
		}

		return $venues;
	}