public function get_min_max_coords() {
		global $wpdb;

		$coords = get_transient( self::ESTIMATION_CACHE_KEY );

		// We have a cached value!
		if ( is_array( $coords ) ) {
			return $coords;
		}

		/**
		 * Allow overriding of queries to get min/max coordinates by returning an array of coordinate values.
		 *
		 * @since 4.4.21
		 *
		 * @param null|array $latlng {
		 * 		Latitude / longitude values for geofencing
		 *
		 *		@type float $max_lat Maximum latitude constraint
		 *		@type float $max_lng Maximum longitude constraint
		 *		@type float $min_lat Minimum latitude constraint
		 *		@type float $min_lng Minimum longitude constraint
		 * }
		 */
		$coords = apply_filters( 'tribe_geoloc_pre_get_min_max_coords', null );

		if ( null === $coords ) {
			$venues_list = $this->get_active_venues();
			$published_venues = array();

			if ( ! empty( $venues_list ) ) {
				$published_venues = $this->filter_published_venues( $venues_list );
			}

			// Only run query if there are events
			if ( ! empty( $published_venues ) ) {
				$venues_ids_prepared = implode( ', ', $published_venues );
				$latitude_key       = self::LAT;
				$longitude_key      = self::LNG;

				$sql = "
					SELECT
						MAX( `coords`.`lat` ) AS `max_lat`,
						MAX( `coords`.`lng` ) AS `max_lng`,
						MIN( `coords`.`lat` ) AS `min_lat`,
						MIN( `coords`.`lng` ) AS `min_lng`
					FROM (
						SELECT `post_id` AS `venue_id`,
							CASE
							WHEN `meta_key` = '{$latitude_key}'
								THEN CAST( `meta_value` AS DECIMAL( 10, 6 ) )
							END AS `lat`,
							CASE
								WHEN `meta_key` = '{$longitude_key}'
								THEN CAST( `meta_value` AS DECIMAL( 10, 6 ) )
							END AS `lng`
						FROM `{$wpdb->postmeta}`
						WHERE
							(
								`meta_key` = '{$latitude_key}'
								OR `meta_key` = '{$longitude_key}'
							)
							AND `post_id` IN ( {$venues_ids_prepared} )
					) AS `coords`
				";

				$coords = $wpdb->get_row( $sql, ARRAY_A );
			}
		}

		if ( ! empty( $coords ) ) {
			// If there is no geoloc data then each result will be null - we cannot pass null values
			// to the Google Maps API however
			$coords = array_map( 'floatval', $coords );
		}

		set_transient( self::ESTIMATION_CACHE_KEY, $coords, DAY_IN_SECONDS );

		// If no coords found, always return an empty array with null args
		if ( empty( $coords ) ) {
			$coords = array(
				'max_lat' => null,
				'max_lng' => null,
				'min_lat' => null,
				'min_lng' => null,
			);
		}

		return $coords;
	}